The administration knows that's their trump card and will keep playing it as long as they can.

政府知道那是他们的王牌，会尽可能长久地使用它。

When his father refused to let him have his own way, the child played his trump card by crying.

看到爸爸没有如自己的意， 那孩子便使出绝招，哇的一声哭了起来。

I must show you the trump card.

我必须告诉你的一张王牌。

It's totally his trump card.

这成了他的王牌了。

Curviness is the trump card.

但是曲线美才是王牌。